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QA bugfix release:
- Fixing #4597: PEAR_INSTALL_DIR constant might be empty
- Fixing #4755: $barcodepath not found in Image/Barcode.php
- Fixing #6637: error don't declare
- Fixing #7693: Wrong include path
- Fixing #7851: Needs flag to supress headers or an option to redirect output to a variable.
- Fixing #8301: Not compatible with Safe Mode
- Fixing #8813: image can't be saved to filesystem
Image_Barcode::draw has an optional fourth parameter determining if
the GD image resource should be returned or output to the browser.
This breaks backwards compatibility for people using drivers directly
which is always a big NO-NO. If your application breaks, it's your chance
to use the class properly.